<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .arrow {
      margin: 0 auto;
      top: 300px;
      position: relative;

      height: 60px;
      width: 60px;
      border: 8px solid blue;
      border-width: 8px 8px 0 0;
      transform: rotate(45deg);
    }
  </style>
</head>
<body>
  <div class="arrow"></div>
</body>
</html>